Brakes - Updated Caliper Wear Adjustment
Number: 92-319A-5Section: 5
Date: MARCH 1993
Corporate Bulletin No.: 265008R
ASE No.: A5
Subject:
BENDIX BRAKE CALIPER WEAR ADJUSTMENT
Model and Year:
1988-92 C/K, G, P, R/V TRUCKS
SERVICE UPDATE
THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 92-319-5, DATED NOV. 1992. THE 1988 MODEL YEAR HAS BEEN ADDED. ALL COPIES OF 92-319-5 SHOULD BE DISCARDED.
The following represents new information for section 5A2 in all 1988-1992 C/K, G, P, RN Model Service Manuals.
This information is in addition to the information found for front or rear disc brake service.
CALIPER AND STEERING KNUCKLE WEAR ADJUSTMENTS:
Bendix brake calipers have oversize replacement keys available to compensate for wear at the caliper to steering knuckle/ anchor plate contact points. The keys are identified by markings as indicated in figure 1. If wear is excessive, a rattle sound can be heard from the front brake area. Use the following procedure to measure and correct this condition.
Refer to figure 1.
1. Remove caliper. Refer to "Caliper."
* You do not need to disconnect the brake hose.
2. Clean surfaces A, B, C, and D with a wire brush.
3. Smooth any deep nicks and/or gouges with a file.
4. Measure caliper contact surface for wear.
A. Lay a straight edge across caliper surfaces "C" and "D."
B. Measure the maximum depth of any wear on these surfaces using feeler gauges.
C. Calipers worn to a depth of 0.050 inch or more should be replaced.
5. Measure caliper to steering knuckle wear.
A. Install caliper back in steering knuckle.
B. Install a new standard size key without the spring.
C. Install the key retention bolt.
D. Insert a screwdriver into the center of the key bumper gap.
E. Pry firmly to ensure the caliper is seated at surfaces "A", "B", and "C."
F. Measure the bumper gap with the largest feeler gauge(s) that will fit into the gap its full length.
G. Select a replacement key according to the table.
6. Install caliper. Refer to "Caliper."